feat: dynamically check for container variants

Change-Id: Id9c0c786ee99013938431032935648223f6e462c

bin/yashchiki

@@ -51,9 +51,11 @@ parser = argparse.ArgumentParser(
               to OUTPUT.
     """))
 
+all_styles = list(os.listdir(os.path.dirname(os.path.realpath(__file__)) + "/../share/yashchiki/styles/"))
+
 # mandatory
 parser.add_argument(
-    "style", type=str, choices=["visionary", "asic", "f27"],
+    "style", type=str, choices=all_styles,
     help="Style of container to build.")
 parser.add_argument(
     "spack_dir", type=pathlib.Path,